This is the CodeSystem that contains codes in both WHO ATC (http://www.whocc.no/atc) and WHO ATC (http://www.whocc.no/atc).
This code system http://hl7.org/fhir/comparison/CodeSystem/59c72e56-3fd0-4edc-84da-7064a6bf4fbf-3432
defines codes, but no codes are represented here